Alignable diffractive pigment flakes

Details Alignable diffractive pigment flakes Alignable diffractive pigment flakes

2007-11-27

2007-11-27

Le, H. T (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S143000, C428S144000, C428S148000, C428S323000

Reexamination Certificate

active

11028819

ABSTRACT:
Diffractive pigment flakes are selectively aligned to form an image. In one embodiment, flakes having a magnetic layer are shaped to facilitate alignment in a magnetic field. In another embodiment, the flakes include a magnetically discontinuous layer. In a particular embodiment, deposition of nickel on a diffraction grating pattern produces magnetic needles along the grating pattern that allow magnetic alignment of the resulting diffractive pigment flakes. Color scans of test samples of magnetically aligned flakes show high differentiation between illumination parallel and perpendicular to the direction of alignment of the magnetic diffractive pigment flakes.

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